harden sandbox escape vectors for bash disabled/restricted modes (#257)

* harden sandbox escape vectors for bash disabled/restricted modes

block git config injection (-c flag as subcommand), dangerous subcommands
(config, submodule, rebase, bisect), code-executing arg flags (--exec,
--extcmd), .gitattributes/.gitmodules writes, and package lifecycle scripts.
add retry logic to test runner for transient failures. add security unit
tests and adhoc attack tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

* only filter subcommands in nobash, remove nobash from ui

* use regex matching

* iterate on tests

* simplify githooks

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -26,8 +26,8 @@
   "dependencies": {
     "@actions/core": "^1.11.1",
     "@anthropic-ai/claude-agent-sdk": "0.2.39",
-    "@ark/fs": "0.53.0",
-    "@ark/util": "0.53.0",
+    "@ark/fs": "0.56.0",
+    "@ark/util": "0.56.0",
     "@octokit/plugin-throttling": "^11.0.3",
     "@octokit/rest": "^22.0.0",
     "@octokit/webhooks-types": "^7.6.1",
@@ -35,7 +35,8 @@
     "@opencode-ai/sdk": "^1.0.143",
     "@standard-schema/spec": "1.0.0",
     "@toon-format/toon": "^1.0.0",
-    "arktype": "2.1.28",
+    "arkregex": "0.0.5",
+    "arktype": "2.1.29",
     "dotenv": "^17.2.3",
     "execa": "^9.6.0",
     "fastmcp": "^3.26.8",